EP 2418660 B1 20140507 - FERRITE POWDER FOR BONDED MAGNET, METHOD FOR PRODUCING SAME AND BONDED MAGNET USING SAME
Title (en)
FERRITE POWDER FOR BONDED MAGNET, METHOD FOR PRODUCING SAME AND BONDED MAGNET USING SAME
Title (de)
FERRITPULVER FÜR EINEN VERBUNDMAGNETEN, VERFAHREN ZU SEINER HERSTELLUNG UND VERBUNDMAGNET DAMIT
Title (fr)
POUDRE DE FERRITE POUR AIMANT LIÉ, SON PROCÉDÉ DE FABRICATION ET AIMANT LIÉ L'UTILISANT
Publication
Application
Priority
- JP 2010056484 W 20100409
- JP 2009095324 A 20090409
- JP 2010090184 A 20100409
Abstract (en)
[origin: EP2418660A1] A bonded magnet is required to have a large energy product, which is the product of magnetization Br and coercive force Hc. However, in a ferrite powder for a bonded magnet, when the particle diameter is reduced to improve the coercive force, the packing properties are impaired, and the Br is lowered. When the particle diameter is increased to improve the magnetization, the coercive force is lowered. Therefore, to increase the energy product, both the Br and Hc must be increased. A ferrite powder that has a large particle size, is composed of smooth crystals, and suffers only a small reduction in coercive force even after pressurization is obtained by mixing a fine ferrite powder having a small particle size with a ferrite powder calcined at a temperature of 1050°C to 1300°C in the presence of a chloride at its saturated vapor pressure and then annealing the mixture at 800°C to 1100°C. A bonded magnet produced using the powder has an energy product of 2.0 MGOe or more.
IPC 8 full level
H01F 1/11 (2006.01); C01G 49/00 (2006.01); H01F 1/113 (2006.01)
CPC (source: EP KR US)
C01G 49/00 (2013.01 - KR); C01G 49/0018 (2013.01 - EP US); C01G 49/0036 (2013.01 - EP US); H01F 1/11 (2013.01 - KR); H01F 1/113 (2013.01 - EP KR US); C01P 2004/20 (2013.01 - EP US); C01P 2004/54 (2013.01 - EP US); C01P 2004/61 (2013.01 - EP US); C01P 2006/10 (2013.01 - EP US); C01P 2006/12 (2013.01 - EP US); C01P 2006/42 (2013.01 - EP US); H01F 1/11 (2013.01 - EP US); Y10T 428/2982 (2015.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
DOCDB simple family (publication)
EP 2418660 A1 20120215; EP 2418660 A4 20121003; EP 2418660 B1 20140507; CN 102388423 A 20120321; CN 102388423 B 20150225; JP 2010263201 A 20101118; JP 5651368 B2 20150114; KR 101648115 B1 20160816; KR 20120006500 A 20120118; US 2012015189 A1 20120119; US 8951635 B2 20150210; WO 2010117070 A1 20101014
DOCDB simple family (application)
EP 10761769 A 20100409; CN 201080016639 A 20100409; JP 2010056484 W 20100409; JP 2010090184 A 20100409; KR 20117023406 A 20100409; US 201013258617 A 20100409